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Reduced gravity aircraft. AKA the Vomit Comet.

You only get ~30 seconds of zero G. How would that work?

Hold it in for three days. Then you're ready to go in a flash.

That would probably make it take longer. A safer bet would be three really strong cups of coffee and two bran muffins.

or get someone who's lactose intolerant and make them drink a carton of milk.